LRC BB187 Datasheet
LESHAN RADIO COMPANY, LTD.
VHF variable capacitance diode
FEATURES
· High linearity
· Excellent matching to 2% DMA
· Ultra small plastic SMD package
· C25: 2.75 pF; ratio: 11
· Low series resistance.
APPLICATIONS
· Electronic tuning in VHF television tuners.
· Voltage controlled oscillators (VCO).
DESCRIPTION
The BB187 is a planar technology variable capacitance diode, in a SOD523 (SC-79)
package. The excellent matching performance is achieved by gliding matching and a
direct matching assembly procedure.
BB 187
1
2
SOD523 SC-79
MARKING CODE:X
1
CATHODE
2
ANODE
1
X
LIMITING V ALUES In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT
V
R
V
RM
I
F
T
stg
T
j
ELECTRICAL CHARACTERISTICS T
continuous reverse voltage – 32 V
peak reverse voltage in series with a 10 kΩ resistor – 35 V
continuous forward current – 2 0 mA
storage temperature –55 +150 °C
operating junction temperature –55 +125 °C
=25°C unless otherwise specified.
j
SYMBOL PARAMETER CONDITIONS MIN. MAX. TYP. UNIT
C
C
∆C
C
I
R
r
C
d(2V)
d(25V)
d
d
s
d
reverse current V R = 30 V; see Fig.2 – – 10 n A
V
= 30 V; T j =85°C; see Fig.2 – – 200 nA
R
diode series resistance f = 470 MHz; V R = 5V – – 0.75 Ω
diode capacitance
V R = 2 V; f = 1 MHz; see Figs 1and 3
V R = 25 V; f = 1 MHz; see Figs 1and 3
29.3 – 34.2 pF
2.57 – 2.92 pF
capacitance ratio f = 1 MH z 11 – –
capacitance matching
V R = 2 to 25 V; in a sequence of 15
diodes(gliding)
––2%
2
BB187–1/2
LESHAN RADIO COMPANY, LTD.
50
40
30
( pF )
d
C
20
f = 1 MHz; T j =25°C
10
0
–1
10
Fig.1 Diode capacitance as a function of reverse voltage; typical values.
1 10 10
V R ( V )
BB 187
2
3
10
(nA)
R
2
I
10
10
0 50 100
T j ( °C )
Fig.2 Reverse current as a function of junction
temperature; maximum values.
–3
10
–4
10
)
-1
( K
d
TC
–5
10
10
–1
1 10 10
2
V R ( V )
Fig.3 Temperature coefficient of diode capacitance as a function of
reverse voltage; typical values.
BB187–2/2
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